► Vegetables make great snacks. Dogs are often fond of carrots, zucchini, and celery, and some cats love zucchini.
► Measure food carefully. Even when using a cup, people varied from an 18 percent underestimate to an 80 percent overestimate, research shows. For cats, cans may make portion-control easier; make sure to use the right size. For homemade food, use only recipes from board-certified veterinary nutritionists.